REST resource code gen

codegen.py

import sys
# Writes the body of a REST resource
# input is a list of <type> <name> variables, one per line:
# i.e:
# String nwDstAddress
# int nwDstLength
# UUID[] inPorts
# [...]

# helloWorld => HELLO_WORLD
def as_constant(name):
    out = []
    prevWasLower = False
    for c in name:
        if c.isupper():
            if prevWasLower:
                out.append('_')
            out.append(c)
            prevWasLower = False
        else:
            prevWasLower = True
            out.append(c.upper())
    return ''.join(out)

fields = []
for line in sys.stdin:
    lst = line.split()
    if len(lst)>0:
        fields.append( lst + [ as_constant(lst[1]) ] )

# Json field names
for field in fields:
    print 'private static final String {} = "{}";'.format(field[2],
            field[1])

print ''

# private fields
for field in fields:
    print 'private final {} {};'.format(field[0], field[1])

print ''

# constructor
args = ',\n'.join([ '@JsonProperty({}) {} {}'.format(x[2],x[0],x[1])
            for x in fields ])

print 'XXXConstructor({}) {{'.format(args)

# constructor body
for field in fields:
    print '    this.{} = {};'.format(field[1], field[1])
print '}'
print ''

# getters
for field in fields:
    print ''
    print '@JsonProperty({})'.format(field[2])
    print 'public {} {}() {{'.format(field[0], field[1])
    print '    return {};'.format(field[1])
    print '}'